The Rasterbator creates huge, rasterized images from any picture. Upload an image, print the resulting multi-page pdf file and assemble the pages into extremely cool looking poster up to 20 meters in size.
T. Maciag, and D. Hepting. 2010 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology, 3, page 436--439. (August 2010)